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Model construction and simulation of soil water movement under Moistube irrigation based
on water potential difference-driven outflow mechanism

1 1，2 2 1 2 3
QI Wei ，ZHANG Zhanyu ，WANG Ce ，HUANG Mingyi ，LIU Chang ，CHEN Yu
（1. College of Water Conservancy and Hydropower Engineering， Hohai University，Nanjing 210098，China；
2. College of Agricultural Science and Engineering，Hohai University，Nanjing 211100，China；
3. Rural Water Conservancy Science and Technology Development Center of Jiangsu Province，Nanjing 210029，China）

Abstract：This study aims at investigating the characteristics of soil water infiltration under moistube irriga⁃
tion and the effect of different influencing factors on it. Based on the outflow mechanism of moistube， a
mathematical model of water movement under moistube irrigation was established by using HYDRUS-2D.
The validation was confirmed by the good agreement between the simulated and measured results. Sensitivi⁃
ty analysis shows that the simulated results are not sensitive to the shape and the hydraulic parameters of
moistube. The simulated results of different situation show that the irrigation water is mainly concentrated
near the tube. As the soil texture becomes heavier， the wetting area and the advancing velocity of wetting
front decrease and the contour of moisture distribution is closer to“concentric circle” With the increasing
.
working pressure head， the wetting area， the advancing velocity of wetting front and the saturation degree
of soil near the tube increase obviously. However，the soil can hardly become saturated under moistube irri⁃
gation under the working pressure head below 200 cm. The buried depth of moistube appreciably affects
the position of wetting area and the time for the wetting front to reach the upper and the bottom bound⁃
ary， but it has little effect on the outflow of moistube and the advancing velocity of wetting front. This
study could bear recommendation for the optimization of moistube irrigation system and the further popular⁃
ization of this technique.
Keywords： Moistube irrigation； outflow mechanism； HYDRUS-2D； water infiltration； sensitivity analysis；
influencing factors

（责任编辑：耿庆斋）

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